Package org.apache.drill.exec.physical.resultSet.impl

Class ListState.ListVectorState

java.lang.Object

org.apache.drill.exec.physical.resultSet.impl.ListState.ListVectorState

All Implemented Interfaces:

VectorState

Enclosing class:

ListState

protected static class ListState.ListVectorState
extends Object
implements VectorState

Wrapper around the list vector (and its optional contained union). Manages the state of the "overhead" vectors such as the bits and offset vectors for the list, and (via the union vector state) the types vector for the union. The union vector state starts of as a dummy state (before the list has been "promoted" to a union) then becomes populated with the union state once the list is promoted.

Constructor Summary

Constructors

Constructor	Description
ListVectorState(ListWriterImpl writer, WriterEvents elementWriter, ListVector vector)
ListVectorState(UnionWriterImpl writer, ListVector vector)

Method Summary

Modifier and Type	Method	Description
int	allocate(int cardinality)	Allocate a new vector with the number of elements given.
void	close()	Clear the vector(s) associated with this state.
void	dump(HierarchicalFormatter format)
void	harvestWithLookAhead()	A batch is being harvested after an overflow.
boolean	isProjected()	Report whether this column is projected (has materialized vectors), or is unprojected (has no materialized backing.)
void	rollover(int cardinality)	A vector has overflowed.
void	startBatchWithLookAhead()	A new batch is starting while an look-ahead vector exists.
ListVector	vector()	Underlying vector: the one presented to the consumer of the result set loader.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ListVectorState

public ListVectorState(UnionWriterImpl writer,
 ListVector vector)

ListVectorState

public ListVectorState(ListWriterImpl writer,
 WriterEvents elementWriter,
 ListVector vector)

Method Details

allocate

public int allocate(int cardinality)

Description copied from interface: VectorState

Allocate a new vector with the number of elements given. If the vector is an array, then the cardinality given is the number of arrays.

Specified by:

allocate in interface VectorState

Parameters:

cardinality - number of elements desired in the allocated vector

Returns:

the number of bytes allocated

rollover

public void rollover(int cardinality)

Description copied from interface: VectorState

A vector has overflowed. Create a new look-ahead vector of the given cardinality, then copy the overflow values from the main vector to the look-ahead vector.

Specified by:

rollover in interface VectorState

Parameters:

cardinality - the number of elements in the new vector. If this vector is an array, then this is the number of arrays

harvestWithLookAhead

public void harvestWithLookAhead()

Description copied from interface: VectorState

A batch is being harvested after an overflow. Put the full batch back into the main vector so it can be harvested.

Specified by:

harvestWithLookAhead in interface VectorState

startBatchWithLookAhead

public void startBatchWithLookAhead()

Description copied from interface: VectorState

A new batch is starting while an look-ahead vector exists. Move the look-ahead buffers into the main vector to prepare for writing the rest of the batch.

Specified by:

startBatchWithLookAhead in interface VectorState

close

public void close()

Description copied from interface: VectorState

Clear the vector(s) associated with this state.

Specified by:

close in interface VectorState

vector

public ListVector vector()

Description copied from interface: VectorState

Underlying vector: the one presented to the consumer of the result set loader.

Specified by:

vector in interface VectorState

isProjected

public boolean isProjected()

Description copied from interface: VectorState

Report whether this column is projected (has materialized vectors), or is unprojected (has no materialized backing.)

Specified by:

isProjected in interface VectorState

Returns:

true if the column is projected to the output, false if not

dump

public void dump(HierarchicalFormatter format)

Specified by:

dump in interface VectorState